﻿/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2021 Thomas Braun, Jens Klingen, Robin Krom
 * 
 * For more information see: https://getgreenshot.org/
 * The Greenshot project is hosted on GitHub https://github.com/greenshot/greenshot
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 1 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Runtime.Serialization;
using Dapplo.Windows.Common.Extensions;
using Dapplo.Windows.Common.Structs;
using Greenshot.Base.Interfaces;
using Greenshot.Base.Interfaces.Drawing;
using Greenshot.Editor.Drawing.Fields;
using Greenshot.Editor.Helpers;

namespace Greenshot.Editor.Drawing
{
    /// <summary>
    /// empty container for filter-only elements
    /// </summary>
    [Serializable]
    public abstract class FilterContainer : DrawableContainer
    {
        public enum PreparedFilterMode
        {
            OBFUSCATE,
            HIGHLIGHT
        };

        public enum PreparedFilter
        {
            BLUR,
            PIXELIZE,
            TEXT_HIGHTLIGHT,
            AREA_HIGHLIGHT,
            GRAYSCALE,
            MAGNIFICATION
        };

        public FilterContainer(ISurface parent) : base(parent)
        {
            Init();
        }

        protected override void OnDeserialized(StreamingContext streamingContext)
        {
            base.OnDeserialized(streamingContext);
            Init();
        }

        private void Init()
        {
            CreateDefaultAdorners();
        }

        protected override void InitializeFields()
        {
            AddField(GetType(), FieldType.LINE_THICKNESS, 0);
            AddField(GetType(), FieldType.LINE_COLOR, Color.Red);
            AddField(GetType(), FieldType.SHADOW, false);
        }

        public override void Draw(Graphics graphics, RenderMode rm)
        {
            int lineThickness = GetFieldValueAsInt(FieldType.LINE_THICKNESS);
            Color lineColor = GetFieldValueAsColor(FieldType.LINE_COLOR);
            bool lineVisible = lineThickness > 0 && Colors.IsVisible(lineColor);
            if (!lineVisible) return;
            bool shadow = GetFieldValueAsBool(FieldType.SHADOW);

            graphics.SmoothingMode = SmoothingMode.HighSpeed;
            graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
            graphics.CompositingQuality = CompositingQuality.HighQuality;
            graphics.PixelOffsetMode = PixelOffsetMode.None;
            //draw shadow first
            if (shadow)
            {
                int basealpha = 100;
                int alpha = basealpha;
                int steps = 5;
                int currentStep = lineVisible ? 1 : 0;
                while (currentStep <= steps)
                {
                    using Pen shadowPen = new Pen(Color.FromArgb(alpha, 100, 100, 100), lineThickness);
                    var shadowRect = new NativeRect(Left + currentStep, Top + currentStep, Width, Height).Normalize();
                    graphics.DrawRectangle(shadowPen, shadowRect);
                    currentStep++;
                    alpha -= basealpha / steps;
                }
            }

            if (lineThickness > 0)
            {
                var rect = new NativeRect(Left, Top, Width, Height).Normalize();
                using Pen pen = new Pen(lineColor, lineThickness);
                graphics.DrawRectangle(pen, rect);
            }
        }
    }
}